He was a member of the USA team that won the gold medal in the Men's 4×400 metres relay at the 2012 IAAF World Indoor Championships.

[3] Another Texas Tech athlete, Michael Mathieu won bronze in the same event competing for the Bahamas.

In 2017 he tested positive for probenecid, but a tribunal hearing found that he "ingested [the] prohibited substance without fault or negligence" after the source was deemed to have occurred after kissing his girlfriend and therefore received no sanctions from the United States Anti-Doping Agency (USADA).

[5] In 2022, Roberts received a 16 month competition ban after testing positive for unintentional use of andarine and ostarine.

[6][7] In June 2024, Roberts received an eight-year competition ban after testing positive for ostarine and other prohibited substances.